But the main point is, Oro is using more chakra than Minato is as Minato's teleportation uses little chakra unless he's teleporting very large objects.. If that cycle continues Orochimaru will run out first.
Sasuke didn't remove his head. Sasuke bisected him. If you remove a snake's head they'll die. If Orochimaru's head is removed he dies.
A>B>C logic works when talking about things like speed and reactions as those do not have some special variable like overall combat does. If you are faster than one person you are faster than every single person slower than that guy as well.
-Madara's so fast SM Naruto can only block. [
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-Tobirama was the fastest shinobi, so blind Madara without SM most likely isn't faster than him. [
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-Minato's Shunshin surpasses Tobirama's. [
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Anyway, Orochimaru's only Fuuton is Great Breakthrough and while it has enough force to rip out a tree it's damage potential is worthless as Sasuke and Sakura as kids were right in the area of effect yet received no injuries. At best he blows Minato and his Kunai away only for Minato to immediately strike again. Snakes don't help either. They don't stop Kunai from reaching his position and them being s/t, thus faster than Shunshin doesn't really matter since being faster than Minato's Shunshin doesn't stop Minato from reaching Orochimaru's position.